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AAZ Injection pump low idle when restarting the car hot
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Topic: AAZ Injection pump low idle when restarting the car hot (Read 2908 times)
July 23, 2021, 09:30:43 am
WeekendMechanic
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AAZ Injection pump low idle when restarting the car hot
«
on:
July 23, 2021, 09:30:43 am »
So this is a later AAZ pump with the vacuum idle and electronic advance retard NOx pollution solenoid.
I've adjusted the idle lever manually to rev an extra 350rpm to 1150 rpm all so increased fuel enrichment from the fuel screw to compensate this drop as well.
But no matter how much I adjust the idle whether high or low. after long trips the idle drops to 750rpm even with ac vacuum on which makes it want to stall under load its as if its pre set to this rpm can it be adjusted with vcds?
Car is a 97 Golf GTD.
«
Last Edit: July 23, 2021, 09:33:08 am by WeekendMechanic
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Reply #1
July 28, 2021, 01:07:28 pm
WeekendMechanic
Junior
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Re: AAZ Injection pump low idle when restarting the car hot
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Reply #1 on:
July 28, 2021, 01:07:28 pm »
People lets brain storm,what would be things inside the pump that would cause an idle drop when hot?
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Reply #2
July 28, 2021, 10:21:32 pm
ORCoaster
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Restoring a Caddy as time and weather allows
Re: AAZ Injection pump low idle when restarting the car hot
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Reply #2 on:
July 28, 2021, 10:21:32 pm »
No Experience with that IP, Saving my two brain cells any trauma.
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Reply #3
July 29, 2021, 01:25:45 am
WeekendMechanic
Junior
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Re: AAZ Injection pump low idle when restarting the car hot
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Reply #3 on:
July 29, 2021, 01:25:45 am »
Its this pump
I have two questions..
Would too low a pressure or too high a pressure inside the pump cause the governor to not keep its default position Iv checked the pressure relief valve and its fine?
What would be the pressures of the return and intake when hot?
This is the way I got it from the shop from a rebuild it was working fine before, to be honest I don't want to take it back and just do it myself.
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Last Edit: July 29, 2021, 03:59:13 am by WeekendMechanic
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Reply #4
July 29, 2021, 11:24:46 am
srgtlord
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Re: AAZ Injection pump low idle when restarting the car hot
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Reply #4 on:
July 29, 2021, 11:24:46 am »
So I had a similar problem on an old pump. It turned out the "OUT" bolt was clogged solid
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Reply #5
July 29, 2021, 12:06:53 pm
WeekendMechanic
Junior
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Re: AAZ Injection pump low idle when restarting the car hot
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Reply #5 on:
July 29, 2021, 12:06:53 pm »
Quote from: srgtlord on July 29, 2021, 11:24:46 am
So I had a similar problem on an old pump. It turned out the "OUT" bolt was clogged solid
Thanks.
So I checked, no clogs...
A note, this pump has never run on veg oil.
«
Last Edit: July 29, 2021, 01:00:27 pm by WeekendMechanic
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Reply #6
July 30, 2021, 12:11:26 pm
WeekendMechanic
Junior
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Re: AAZ Injection pump low idle when restarting the car hot
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Reply #6 on:
July 30, 2021, 12:11:26 pm »
I give up...
One question I'm going to buy a new pump, I know they greased them up on assembly, but how long can they remain in storage before they go bad, I'm asking cause its an old pump and i don't know how long the shop has had it for, please the listing was uploaded 3 years ago.
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Last Edit: August 02, 2021, 09:33:59 am by WeekendMechanic
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Reply #7
August 31, 2021, 12:57:40 pm
WeekendMechanic
Junior
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Re: AAZ Injection pump low idle when restarting the car hot
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Reply #7 on:
August 31, 2021, 12:57:40 pm »
So I installed the new pump and the difference is night and day.
So smooth it's like butter, even with the A/c on, no stalling, it eats it for breakfast, parking and uphill power is always available.
So now I've got a spare pump that stalls at low rpm, I haven't cracked it open yet, but does anyone know what to look for first?
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Last Edit: August 31, 2021, 10:45:00 pm by ORCoaster
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Reply #8
August 31, 2021, 10:43:08 pm
ORCoaster
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Restoring a Caddy as time and weather allows
Re: AAZ Injection pump low idle when restarting the car hot
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Reply #8 on:
August 31, 2021, 10:43:08 pm »
The first thing you look for is a place to dig a deep hole and bury that bad boy. Think of it no more, you're all set with the new pump. Don't look back.
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Reply #9
September 01, 2021, 12:51:45 am
fatmobile
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Re: AAZ Injection pump low idle when restarting the car hot
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Reply #9 on:
September 01, 2021, 12:51:45 am »
I'd check the governor springs.
the ones captured/caged coming from the lever.
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Tornado red, '91 Golf 4 door,
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AAZ Injection pump low idle when restarting the car hot